I am having both my father and my uncle walk me down the isle. I know this is not traditional but my uncle has played an important role in my life. Should he match the father of the groom, father of the bride and the groomsmen. Should they all match?
Don't worry about being traditional. If this arrangement is okay with your dad then go fo it.
Since the father of the bride wears clothing similar to the groomsmen; your Uncle should match them all. Top Wedding Questions Forum Moderator - "Write your sorrows in the sand, your blessings in stone".